Six months is an extremely long quarantine.. I do three months usually.

Quarantines should be kept in a different room if possible, or at least as far from your established herps as possible. Feed/handle your established animals first. Wash your hands for at least 30 seconds in hot water and antibacterial soap after handling or doing anything with the quarantines. Use different tools (hooks, spray bottles, etc.. anything really) for quarantines.